“ Work for the construction of the 3rd defence-line"---China's preparation for tWW III.

the construction of the 3rd defence-line is one enormous industry_shift tide in CHina during Cold war, it is CHina's emergent preparation for the possbile WW III.

its aim was to set up a completely independent military-industry base in the heartland of CHina, to sustain CHina's prolong resistence against potentcial rivals such as Soviet or USA during the coming WW III.

the deepest yellow is the heartland of CHina, where "the 3rd defence-line" was set up.

1. China mihgt have to fall into war against Soviet and USA at the same time.
In 1960s, sino-soivet aliance split and Soviet became the enemy of CHina.
At the same time, USA had been the enemy of CHina since Korea war and still fought against CHina indirectly throught a proxy war-"Vietnam War".

2.Most CHina's military-Industry base was located in coastal CHina and Northeast CHina.
there was few modern industry in heartland CHina.

3.historic lesson of WWII.
During WWII, because China had not modern military industry and could not supply enough weapons and ammunition ,Chinese troops could suffer heavy loss and lost lots of battles...

CAEP in Mianya City, Sichuan province. it is China's top nuke R&D unit,famous for its unique contribution to China's nuke weapons and space industry.
It has the most advanced R&D infrastructure of nuke&space&aircraft preject.,such as windy_tunnel project